chemical engineering MCQs – Page 369

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs
7361. Amount of coal lost in ash particle, which is carried through the boiler system, depends upon the__________________?
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A. Physical nature, ash content and fineness of the coal

B. Type of burner and combustion chamber

C. Amount of excess air supplied and load on the boiler

D. All A., B. and C.
7362. Pick out the wrong statement?
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A. Pure rubber is as useless as pure gold as a material of construction

B. Thermal conductivity of aluminium is higher than that of copper; hence it is increasingly used for utensil making

C. Copper has poor weldability

D. Reinforced plastics are made from both thermoplastic as well as thermosetting plastics

7363. The preferred material of construction for storage tanks for 98% sulphuric acid is_________________?
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A. Lead

B. Aluminium

C. Mild steel

D. Stainless steel 316

7364. Which of the following variables affects the furnace capacity ?
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A. Thickness of heating stock

B. All A., B. and C.

C. Temperature of flue gas

D. Thermal conductivity of stock

7365. The electric furnace in which heat is produced by a combination of induced current and skin effect is called _____________ furnace?
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A. High frequency induction

B. Resistance

C. Arc

D. Low frequency induction

7366. An example of a periodic furnace is the__________________?
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A. Coke oven heating chamber

B. Blast furnace

C. Rotary kilns

D. Blast furnace stoves
7367. In a furnace operation, which is not preheated ?
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A. Solid fuels

B. Hydrocarbon containing fuel gases (e.g. coke oven gas, refinery gas etc.)

C. Both A. and B.

D. Neither A. nor B.

7368. Electronic structure of a material is generally studied by__________________?
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A. Spectroscopic techniques

B. Electron diffraction

C. X-ray

D. Metallurgical microscope

7369. Circulation of gases in furnace is caused by the_________________?
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A. Furnace pressure in conjunction with draft in flues

B. Difference in density between hot and cold gases

C. All A., B. and C.

D. Change in volume during a change of temperature

7370. Monel alloy is____________________?
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A. Used for making steam valves and turbine blades as it resists steam attack at high temperature

B. The costliest of all the alloys of nickel

C. Not suitable for making kitchen utensils

D. Not used in cast and wrought forms

7371. Pick out the wrong statement ?
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A. Momentum transfer in laminar flow results from velocity gradient

B. A fluid in equilibrium is not free from shear stress

C. The viscosity of a non-Newtonian fluid is a function of temperature only

D. Both B. and C.
7372. Which of the following accentuates clinkering troubles on furnace grate burning coal ?
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A. Low forced draft & fuel bed temperature

B. All A., B. and C.

C. Low reactivity of carbonised residue containing high proportion of iron & sulphur

D. Thick firebed and preheated primary air

7373. The formation of oxide film on a metal due to atmospheric exposure reduces its____________?
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A. Toughness

B. All A., B. & C.

C. Stiffness

D. Creep limit
7374. Dampers are located__________________?
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A. Near the top of the chimney

B. Anywhere after the I.D. fan

C. After the I.D. fan

D. Before the I.D fan
7375. Fermenter used in the production of penicillin by deep fermentation process is a ______________ lined steel vessel ?
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A. Monel

B. Rubber

C. Glass

D. Nickel

7376. Pick out the correct statement?
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A. Stainless steel is nothing but chromium coated steel

B. Hardening of a soft metal can be done by alloying it with another metal or non-metal

C. Rusting of iron is not electrochemical in nature

D. Plastic deformation of a material is its temporary distortion under the action of applied stress

7377. Regenerators as compared to recuperators for the same duty_________________?
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A. Are lighter & compact

B. Involve higher initial cost

C. All A., B. & C.

D. Store smaller quantity of waste heat

7378. White cast iron is not__________________?
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A. Whitish in color

B. Strong and hard

C. Malleable

D. Brittle

7379. Maximum thermal efficiency of boiler may be about _____________ percent?
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A. 90

B. 25

C. 10

D. 65

7380. Very high pressure boilers are usually _____________ boilers?
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A. Waste heat

B. Natural circulation

C. Water tube

D. Fire tube